Question

I have installed Exchange 2007 to coexist with our current Exchange 2003 system. Everything in our exchange 2003 system is working properly, and exch2003 can send mail to exch2007. However, exch2007 CANNOT send mail to exch2003. Mail can leave my exch2007 to go to internet through the Edge server, but not internally through the Hub transport. I have checked and both of the Routing Group Connectors are there and properly configured.

Might want to add the new server to the list of servers allowed to connect to the mx03 server rather than removing the rules altogether. Last thing you want is your server ending up as an open relay for spammers (or a botnet which ended up on your lan).

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